Hart has begun to shore up his most serious problem nationally, which is lack of money. He raised more than $150,000 in four events between April 16 and April 26, giving his cash-starved campaign a vital infusion. Half the money was raised at an event in Denver, $35,000 at an event in Los Angeles, $30,000 in Dallas and $15,000 in New York.

However, Hart's campaign may have a problem in the one state where he's been doing well, Iowa--where the first caucuses of 1984 will be held in February.

Hart had begun to put together an impressive Iowa organization earlier than other candidates, thanks to the work of Bill Romjue, who had organized the state for President Carter in 1980. But there are signs that Hart's Iowa campaign has reached a plateau, and Romjue has been criticized for some of his tactics. Romjue reportedly irritated some Iowa Democrats by spreading the word that he had commitments for Hart from some people who actually were still uncommitted.

Democrats say Romjue also suffers from wounds left over from the bitter 1980 campaign between Carter and Sen. Edward M. Kennedy (D-Mass.).

Romjue angrily attributed the attacks to Cranston supporters, who he said are out to get him. "If you can do damage to me as an organizer, you can do damage to the candidate," he said. "The one person Walter Mondale is worried about here is Gary Hart. The rest of them are going to have to climb by us."

A Hart campaign official said that in the future Romjue will spend less time in Iowa and more time organizing neighboring midwestern states.